文献翻译运动型7速双离合器变速器系统.docx

文献翻译运动型7速双离合器变速器系统.docx

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文献翻译运动型7速双离合器变速器系统

附　　录

附录A外文文献原文

7-SpeedDualClutchTransmissionSystemforSportyApplication

ABSTRACT:

Withits7-speeddualclutchtransmission,ZFhasintroducedaninnovativetransmissionforsportyapplications.Thecloseratioscombinedwithextremelyspontaneousdrivebehaviormakesitanidealtransmissionforsportyapplications.Thisarticledescribesthecompactgearsetwithlubricationbyinjectionforimprovingthelevelofefficiencyandincreasingtheengine-speed-strength,thedualclutchunitaswellasthehydrauliccontrolunit,whichisbasedonthepre-controlprinciple,arealsodescribedindetail.Thehy-drauliccontrolprincipleprovidestheoptionofahydrauliccruisemodeintheeventofanelectronicsfailure.Inadditiontothetransmissiondesign,functionalfeaturesthatalsohighlightthesportycharacterofthetransmissionaredescribedindetail.

Keywords:

Automatictransmission;Dualclutch;Vehicleconnection;Efficiency

1Introduction

Whenitcomestothefieldofautomatictransmissions,dualclutchsystemscurrentlyrepresentthebenchmarkintermsofspontaneityandsportiness.Inthistypeoftransmission,whichisbasedonacountershafttransmission,theseadvantagesarecombinedwithaverydirect"vehicleconnection",highrpmperformance,andexcellenttransmissionefficiency.

The7-speeddualclutchtransmissionforthestandarddrivelinepresentedhereisdesignedforatorquecapacityofupto520Nmandrotationalspeedsofupto9250rpms.Inordertobeabletoachievetheseperformancedataintheexistinginstallationspace,aconceptwasdevelopedinwhichanoilchamberaswellaslubricationbyinjectionareused.Beforeintroducingthetransmission′sseveraluniquefeaturesinmoredetailbelow,anoverviewofthebasictransmissiondesignwillbepresented,Fig.1.Theenginetorqueisintroducedtothedualclutchviaatorsiondamper（notshowninFig.1）.Themultidiskclutchesinthedualclutchareradiallynestedinoneanotherandtransferthetorquetobothinputshaftsinthecountershafttransmissiongearset.Inthiscase,duetotheinstallationspace,thecountershaftisnotlocatedunderthemainshaft,butistiltedlaterally.Thisbecomespossiblebecausetheconceptisbasedonlubricationbyinjectionwithadrysump.Ontheonehand,lubricationbyinjectionimprovesheatremoval,ontheother,therearenonoticeablelossesduetothegearssplashingintheoilpan.Theoilissuppliedtothetransmissionviaaninternalgearpumpwhichisdrivenbyaspurgeartrainbehindthedualclutch.Withthehelpofaspurgeartrain,thedriveunithastheadvantagethat,viadifferentgearratiophasesanddependingontheintendeduse,theflowrateandthemax.speedofthepumpcanbeadapted.AnadditionaladvantageisthatbasedontheresultingIprovedinstallationspace,anoptimalratiobetweenthepumpwidthandthepumpdiametercanbeachievedforthepump′slevelofefficiency.Thehydrauliccontrolunitisarrangedunderthegearset.Thehydraulicunitsuppliestheclutch,basedonneed,withpressureandcoolingoilaswellasshiftactuators.Thelatterarearrangedlaterallytothegearsetandworkwithdouble-actingcylinders.Thesensorfordetectingthepositionofthegearshiftsisattacheddirectlyontothefourgearshifts.Thetransmissionhasanexternalcontrolunit.

Fig.1　Overviewdualclutchtransmission（DCT）

2Sevenspeedswithsophisticatedstepping-aconceptforextrmesporti-ness

Thegearsetconceptofthedualclutchtransmissionintroducedherewasdevelopedinhousetakingintoconsiderationthefollowingrequirements:

Highpowerdensity

Highspeedendurancestrengthupto9250rpmVariabilityandmodulardesign

Representationoftransmission-ratiospreadsofabout4.7and6.8with7speeds

Useofexistingsynergiesformanualtransmissions

Afterextensivesystematicdevelopmentofthegearsetinwhichmanythousandsofvariantswereproducedandcompared,thegearsetconceptthatisillustratedinFig.2isthefinalvariantandtheidealconceptforachievingthegoalsspecified.

Thegearsetselectedisbasedontheconstantdriveconceptandconsistsoftwoconcentricdriveshaftseachofwhicharedrivenbyoneofthetwomultidiskclutchesinthe

Fig.2　Gearsetschemeof7Dvariant

dualclutch,twocountershaftsalsoconcentrictooneanother,amainshaftandanoutputshaft.ThegearratiosareengagedbythefoursynchronizerunitsA/B,C/D,E/F,andG/H,whicharearrangedonthemainshaftandonthehollowcountershaftandtheseareconnectedtotheloosewheelsortheadjacentshafts.AnimportantfeatureinthegearsetistheconnectabilityofbothcountershaftsthroughtheC/Dsynchronizerunit.IntheDshiftposition,thegearratiosselectedinthiswaycanbedoublyusedwhichreducesconstructioncostscomparedtoconventionaldualclutchgearset